
The term \(H_{0}\)  is the Hamiltonian of the exciton, with \(m_{e/h}\) 
the electron/hole effective mass, \(\mu ^{-1}=m_{e}^{-1}+m_{h}^{-1}\) 
the reduced mass of the electron-hole pair, \(p\)  their relative momentum,
\(\mathbf {r}\)  their relative position vector and \(V(r)\)  the electron-hole
interaction potential which we model using the Rytova-Keldysh potential
[1]}, [2]}
\(V(r)=-\frac{e^{2}}{4\pi \epsilon _{0}}\frac{\pi }{2r_{0}}\left[\mathbf {H}_{0}\left(\frac{\kappa r}{r_{0}}\right)-Y_{0}\left(\frac{\kappa r}{r_{0}}\right)\right],\) 
